diff --git a/requirements.txt b/requirements.txt
index 5b58bd5..d48b046 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ pytest
 pillow
 svgwrite
 cairosvg
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability